// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_BROWSER_DOWNLOAD_URL_DOWNLOADER_H_
#define CONTENT_BROWSER_DOWNLOAD_URL_DOWNLOADER_H_

#include <stdint.h>

#include <memory>

#include "base/memory/weak_ptr.h"
#include "content/browser/download/download_request_core.h"
#include "content/public/browser/download_interrupt_reasons.h"
#include "content/public/browser/download_save_info.h"
#include "content/public/browser/download_url_parameters.h"
#include "content/public/common/referrer.h"
#include "net/url_request/redirect_info.h"
#include "net/url_request/url_request.h"

namespace content {
class ByteStreamReader;
struct DownloadCreateInfo;
class DownloadManagerImpl;

class UrlDownloader : public net::URLRequest::Delegate,
                      public DownloadRequestCore::Delegate {
public:
    UrlDownloader(std::unique_ptr<net::URLRequest> request,
        base::WeakPtr<DownloadManagerImpl> manager);
    ~UrlDownloader() override;

    static std::unique_ptr<UrlDownloader> BeginDownload(
        base::WeakPtr<DownloadManagerImpl> download_manager,
        std::unique_ptr<net::URLRequest> request,
        const Referrer& referrer);

private:
    class RequestHandle;

    void Start();

    // URLRequest::Delegate:
    void OnReceivedRedirect(net::URLRequest* request,
        const net::RedirectInfo& redirect_info,
        bool* defer_redirect) override;
    void OnResponseStarted(net::URLRequest* request, int net_error) override;
    void OnReadCompleted(net::URLRequest* request, int bytes_read) override;

    void StartReading(bool is_continuation);
    void ResponseCompleted(int net_error);

    // DownloadRequestCore::Delegate
    void OnStart(
        std::unique_ptr<DownloadCreateInfo> download_create_info,
        std::unique_ptr<ByteStreamReader> stream_reader,
        const DownloadUrlParameters::OnStartedCallback& callback) override;
    void OnReadyToRead() override;

    void PauseRequest();
    void ResumeRequest();
    void CancelRequest();

    // Called when the UrlDownloader is done with the request. Posts a task to
    // remove itself from its download manager, which in turn would cause the
    // UrlDownloader to be freed.
    void Destroy();

    std::unique_ptr<net::URLRequest> request_;
    base::WeakPtr<DownloadManagerImpl> manager_;
    DownloadRequestCore core_;

    base::WeakPtrFactory<UrlDownloader> weak_ptr_factory_;
};

} // namespace content

#endif // CONTENT_BROWSER_DOWNLOAD_URL_DOWNLOADER_H_
